PURPOSE: To automatically detect the charging of alloy and the dropping of stuck metal and to prevent the overlooking operation by observing a vacuum degassing vessel with an image pickup device and treating the obtd. picture.
CONSTITUTION: The image pickup device 13 is arranged at the position being possible to take the picture to the exposed surface of molten steel in the vacuum degassing vessel 12. The picture area of the molten steel part exceeding the preset brightness level is obtd. from the brightness information of the molten steel temp., stuck metal, dropped metal and charged alloy shown in the figure in the vessel picking up the image by this method. The possessed ratio of the picture area at the part exceeding this brightness level in the whole figure area in the vessel 12 is calculated by an image processor 17. When this ratio is less than the preset area ratio value, it is judged to charge the alloy or to drop the metal. By this method, miss charge of the alloy or the dropping of the metal can quickly be detected and the countermeasure is quickly N, and the components in the molten steel can be stabilized.
NARIMATSU TAKANORI
FUJISAKI KEISUKE
MORIGUCHI MAKOTO
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